<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id = "app">
    {{msg}}
  </div>

</body>

<script src="js/vue.js"></script>
<script>
  const app = new Vue({
    el:'#app',
    data:{
      msg:'hello world'
    },
    methods:{

    }
  })
</script>
</html>